I posted this one a few days ago. I just found I have this one by the same person. He's been doing this for a number of years I'd say. Lol Notice that the Counterstamp is a slightly different font. Maybe he wore the other one out. Lol
J.T Smith was a jeweler from Schuylerville NY. His counterstamp is listed in Rulau Catalog (NY-Sc 2-3) The listing also describes it being stamped on other denominations.